Effect of Fe doping on the gas sensing properties of nano-crystalline SnO2 thin films

Rani, Sanju; Roy, Somnath C.; Bhatnagar, M.C.

doi:10.1016/j.snb.2006.05.032

Cited by 100 publications

(31 citation statements)

References 22 publications

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“…The calculations show that the Fe-doping makes effects on the size of the nanoparticles where nanoparticles' diameter decreases from 26.7 to 17.9 nm as the Fe 3+ content increases from 0.0 to 4%. Moreover, it can be noted that doping SnO 2 with Fe 3+ can hinder the grain growth as well, and this supports the observance of decreasing crystallite sizes [23,24].…”

Section: Resultssupporting

confidence: 68%

Structural and Optical Properties of Nanostructured Fe-Doped SnO₂

2016

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Nanocrystalline Sn1−xFexO2 (where x = 0, 0.01, 0.02, 0.03 and 0.04) powders have been successfully synthesized by the hydrothermal method followed by sintering at 1000• C for 3 h. The morphology and structure of the samples have been analyzed by field emission scanning electron microscope and X-ray diffraction, respectively. X-ray diffraction results revealed that all diffraction peaks positions agree well with the reflection of a tetragonal rutile structure of SnO2 phase without extra peaks. The formation of a tetragonal rutile structure of SnO2 nanostructures was further supported by the Raman spectra. The band gap of Fe-doped SnO2 nanoparticles was estimated from the diffuse reflectance spectra using the Kubelka-Munk function and it was decreasing slightly with the increase of Fe ion concentration from 3.59 to 3.52 eV. The variation in band gap is attributed predominantly to the lattice strain and particle size. The presence of chemical bonding was confirmed by the Fourier transform infrared spectra.

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Section: Resultssupporting

confidence: 68%

Structural and Optical Properties of Nanostructured Fe-Doped SnO₂

2016

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“…To quantitatively assess the film quality, the full-width at half-maximum (FWHM) values of the (222) peak and the crystallite dimension were estimated according to Scherrer's formula [17], t = 0.9λ/βcosθ, where λ is the X-ray wavelength, β is the full-width at half-maximum of the (222) diffraction line, and θ is the diffraction angle of the XRD spectra ( Figure 2). The FWHM values are 0.261°, 0.253°, 0.219° and 0.21° for the Ta-doped In 2 O 3 films before and after annealing at 400°C, 500°C and 600°C, respectively.…”

Section: Resultsmentioning

confidence: 99%

Influence of post-annealing on the properties of Ta-doped In2O3 transparent conductive films

Wang

Liu

et al. 2011

Chin. Sci. Bull.

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Ta-doped In 2 O 3 transparent conductive oxide films were deposited on glass substrates using radio-frequency (RF) sputtering at 300°C. The influence of post-annealing on the structural, morphologic, electrical and optical properties of the films was investigated using X-ray diffraction, field emission scanning electron microscopy, Hall measurements and optical transmission spectroscopy. The obtained films were polycrystalline with a cubic structure and were preferentially oriented in the (222)

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“…Of the methods used to prepare these oxides, those that are most commonly cited in the literature require the use of thin films (< 1 micrometer). However, in some cases thick films are used, doped with noble metals or various nanoshapes designed to effect grain boundaries [18][19][20][21][22][23][24][25]. These metal oxide sensors must be heated to elevated temperatures that range from 100 to 600°C [18,[26][27][28] which, in many cases for the effective monitoring of a given analyte, must be precisely controlled.…”

Section: The Interfacementioning

confidence: 99%

Nanostructure directed interfaces created from nanoparticle island sites deposited to microporous arrays and forming sensor platforms

Gole¹,

Laminack²,

Boudreaux³

2017

Front Nanosci Nanotech

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Novel nanostructured island sites are made to decorate a microporous/nanoporous array. These island sites are formed from a variety of easily produced nanostructured metal oxides deposited from solution. Sensor platforms are distinct from and do not require film-based coating. The nanostructure directing acidic metal oxide sites which vary in their Lewis acidity decorate micropores and control the electron transduction process. The interaction of analytes with these island sites varies in a predictable manner and can be modified through in-situ functionalization of their Lewis acidity. The microporous structure allows rapid Fickian diffusion of analytes to the active nanostructure island sites whose reversible interaction dominates the sensor response as it requires low energy consumption. Highly accurate repeat depositions are not required. We require that the island sites are deposited at sufficiently low concentration so as not to interact electronically with each other. The response time of these interfaces is more rapid than film-based depositions, which require a more lengthy diffusion time. The sensors are reversible. The nanoporous structure prevents sintering of these island centers at elevated temperatures. The concentration of detection centers can be made to produce an optimum matrix of enhanced sensor responses, force a dominant distinct analyte-interface physisorption (rather than chemisorption). The produced semiconductor interface is easily functionalized to create an enhanced range of nanoparticle semiconductor sites. The matrix provides a sensitive means of transferring electrons that are easily detected. The sensors operate at room temperature as well as elevated temperatures. Low energy magnetic field signal enhancement can be achieved with transition metals. Contaminated sensors can be readily rejuvenated. Pulsed mode operation ensures low analyte consumption and high analyte selectivity and further provides the ability to rapidly assess false positive signals using Fast Fourier Transfer techniques, Solar pumped sensors requiring low light levels (≤ 1 Watt) have been demonstrated. Water vapor contamination can be greatly if not entirely reduced. The modelling of sensor response with a new Fermi energy distribution -based response isotherm is found to be superior to other isotherms. Sensors operate can be made to operate efficiently for two gases simultaneously. Modes of extending these studies to multiple gas arrays are considered.

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Effect of Fe doping on the gas sensing properties of nano-crystalline SnO2 thin films

Cited by 100 publications

References 22 publications

Structural and Optical Properties of Nanostructured Fe-Doped SnO₂

Structural and Optical Properties of Nanostructured Fe-Doped SnO₂

Influence of post-annealing on the properties of Ta-doped In2O3 transparent conductive films

Nanostructure directed interfaces created from nanoparticle island sites deposited to microporous arrays and forming sensor platforms

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Effect of Fe doping on the gas sensing properties of nano-crystalline SnO2 thin films

Cited by 100 publications

References 22 publications

Structural and Optical Properties of Nanostructured Fe-Doped SnO2

Structural and Optical Properties of Nanostructured Fe-Doped SnO2

Influence of post-annealing on the properties of Ta-doped In2O3 transparent conductive films

Nanostructure directed interfaces created from nanoparticle island sites deposited to microporous arrays and forming sensor platforms

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Product

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Structural and Optical Properties of Nanostructured Fe-Doped SnO₂

Structural and Optical Properties of Nanostructured Fe-Doped SnO₂